The bond enthalpy for the ond in N2 is 945 kJ/mol. The bond enthalpy for the bon

Question

The bond enthalpy for the ond in N2 is 945 kJ/mol. The bond enthalpy for the bond in O2 is 498 kj/mol. The bond enthalpies for the bonds, N-N, N-O, and N(DOUBLE BOND) O are 163, 201, and 607 kJ/mol, respectively. what is the approximate reaction enthalpy for the reaction N2 + 2O2 --> N2O4 (the structure of N2O4 has two NO2 groups connected together at the nitrogen atoms. Hint: the Lewis structure of N2O4 should contain two N (double bond) O and two N-O bonds?)

a) +162 kJ

b) -162 kJ

c) +1941 kJ

d) +1779 kJ

e) none of these

Explanation / Answer

dH = [(2*607)+(2*201)+163] - [(945)+(2*498)] = -162 kJ/mol

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